"After dealing with the stress of the past year, Catherine made the decision to check in to a mental health facility for a brief stay to treat her Bipolar II Disorder," the actress's publicist Cece Yorke said in a statement.

"She's feeling great and looking forward to starting work this week on her two upcoming films," the statement said.

It was not immediately clear when or where the British actress had sought the treatment or when she was diagnosed with bipolar disorder.

Douglas, the star of "Wall Street," underwent chemotherapy for stage 4 throat cancer last year but said in January his tumor has gone. Douglas's son Cameron from a previous marriage was sentenced to prison last year on drug charges.

Zeta-Jones, 41, who won an Oscar for her role in "Chicago," was photographed at Buckingham Palace in London in February where she was awarded a Commander of the Order of the British Empire medal by Prince Charles for her services to charity and the film industry.